Idek but we should have CR. Maybe Zelos's mom...reads Tony's books and considers him a family friend??? Bugs him about Zelos and asks him to look out for the kid and Tony is like UGH... /checks in periodically to make sure Zelos isn't wanted by the mafia or something. /Offers unwanted adivce. /Gives Zelos unasked for drinks from bars like the terrible role model he is.

Tony is an hot shot author to put the above in context laughs. As such could also be they met at a fancy celebrity type party or a modeling show Tony was invited to. Or they awkwardly share several exs and Tony frequently comments one of them needs to get better taste.